Breadcrumb

Codes and Our Role as National Grid Code Administrator

Electricity codes form the framework and rules for operating the British electricity transmission network. Each of the codes focuses on a different area of the industry. Find out more about the codes below.

We are Code Administrator for the Connection and Use of System Code (CUSC), The Grid Code and the System Operator - Transmission Owner Code (STC). We also have a role administering the Security and Quality of Supply Standards (SQSS).

We play an important role in allowing industry parties to propose changes, debate important issues and drive key outcomes in code modification processes. In addition we help protect the interests of small market participants and consumers through the adoption of key code administration principles - Code Administration Code of Practice (CACoP).

Meet the team

Code modifications search

Modifications (Mods) are raised to propose changes to a number of different codes. They can revise any part of the code that they relate to.

Current or concluded modifications can be searched for by name or ID. They can also be filtered by current or concluded. By clicking ID, Name, Status and Last updated you can sort modifications to suit your requirements.

ESO Code Administrator Improvements Page

Here you will find all the improvements that we are currently making based on feedback that you have given us and our commitments under the Forward Plan Principal 4 Deliverables.